#top{
    width: 780px;
    height: 183px;
    margin-bottom: 1px;
}
#banner{
    width: 780px;
    height: 150px;
    background: url(../img/banner.jpg) no-repeat;
}
#nav li{
    float: left;
    width: 78px;
    height: 33px;
    background: url(../img/button1.jpg) no-repeat;
    line-height: 33px;
    display: block;
    text-align: center;
}
#nav a{
    font-size: 12px;
    color: #004A87;
}
#nav a:hover{
    bottom: 1px;
    right: 1px;
    position: relative;
    background: url(../img/button1_bg.jpg) no-repeat;
    display: block;
}